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  • Branching fraction and phot...
    Hinson, J W; Lee, J; Miller, D H; Lyon, A L; Coan, T E; Gao, Y S; Maravin, Y; Benslama, K; Dambasuren, E; Mountain, R; Skwarnicki, T; Wang, J C; Wolf, A; Kopp, S; Mahmood, A H; Csorna, S E; Danko, I; McLean, K W; Bonvicini, G; Cinabro, D; Bornheim, A; Lipeles, E; Pappas, S P; Shapiro, A; Sun, W M; Weinstein, A J; Masek, G; Asner, D M; Eppich, A; Hill, T S; Morrison, R J; Briere, R A; Chen, G P; Ferguson, T; Vogel, H; Alexander, J P; Berger, B E; Drell, P S; Ehrlich, R; Gaidarev, P; Gibbons, L; Gray, S W; Heltsley, B K; Hsu, L; Kandaswamy, J; Lohner, M; Magerkurth, A; Meyer, T O; Mistry, N B; Palmer, M; Patterson, J R; Peterson, D; Riley, D; Romano, A; Thayer, J G; Valant-Spaight, B; Warburton, A; Avery, P; Prescott, C; Rubiera, A I; Yelton, J; Brandenburg, G; Bergfeld, T; Ernst, J; Gladding, G E; Gollin, G D; Hans, R M; Johnson, E; Marsh, M A; Sedlack, C; Selen, M; Thaler, J J; Williams, J; Edwards, K W; Ammar, R; Bean, A; Frolov, V V; Lee, S J; Smith, A; Stepaniak, C J; Urheim, J; Ahmed, S; Alam, M S; Athar, S B; Ling, L; Saleem, M; Timm, S; Wappler, F; Anastassov, A; Honscheid, K; Hufnagel, D; Kagan, H; Kass, R; Pedlar, T K; Thayer, J B; von Toerne, E; Zoeller, M M; Richichi, S J; Skubic, P; Savinov, V

    Physical review letters, 12/2001, Letnik: 87, Številka: 25
    Journal Article

    We have measured the branching fraction and photon energy spectrum for the radiative penguin process b-->s gamma. We find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-4), where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, <E( gamma)> = 2.346+/-0.032+/-0.011 GeV, and <E(2)(gamma)>-<E(gamma)>(2) = 0.0226+/-0.0066+/-0.0020 GeV(2), where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/M(3)(B) and beta(0)alpha(2)(s)) the heavy quark effective theory parameter Lambda = 0.35+/-0.08+/-0.10 GeV.